<!doctype html>
<html>
<head>
    <title>Network | Clustering</title>

    <script type="text/javascript" src="../../../dist/vis.js"></script>
    <link href="../../../dist/vis.css" rel="stylesheet" type="text/css"/>

    <style type="text/css">
        #mynetwork {
            width: 600px;
            height: 600px;
            border: 1px solid lightgray;
        }

        p {
            max-width: 600px;
        }

        h4 {
            margin-bottom: 3px;
        }
    </style>
    <script src="../../googleAnalytics.js"></script>
</head>

<body>


<p>
    You can zoom in and out to cluster/decluster.
</p>
Stabilize when clustering:<input type="checkbox" id="stabilizeCheckbox">
<div id="mynetwork"></div>

<script type="text/javascript">
    var clusterIndex = 0;
    var clusters = [];
    var lastClusterZoomLevel = 0;
    var clusterFactor = 0.9;

    // create an array with nodes
    var nodes = [
        {id: 1, label: 'Node 1'},
        {id: 2, label: 'Node 2'},
        {id: 3, label: 'Node 3'},
        {id: 4, label: 'Node 4'},
        {id: 5, label: 'Node 5'},
        {id: 6, label: 'Node 6'},
        {id: 7, label: 'Node 7'},
        {id: 8, label: 'Node 8'},
        {id: 9, label: 'Node 9'},
        {id: 10, label: 'Node 10'}
    ];

    // create an array with edges
    var edges = [
        {from: 1, to: 2},
        {from: 1, to: 3},
        {from: 10, to: 4},
        {from: 2, to: 5},
        {from: 6, to: 2},
        {from: 7, to: 5},
        {from: 8, to: 6},
        {from: 9, to: 7},
        {from: 10, to: 9}
    ];

    // create a network
    var container = document.getElementById('mynetwork');
    var data = {
        nodes: nodes,
        edges: edges
    };
    var options = {layout: {randomSeed: 8}};
    var network = new vis.Network(container, data, options);

    // set the first initial zoom level
    network.once('initRedraw', function() {
        if (lastClusterZoomLevel === 0) {
            lastClusterZoomLevel = network.getScale();
        }
    });

    // we use the zoom event for our clustering
    network.on('zoom', function (params) {
        if (params.direction == '-') {
            if (params.scale < lastClusterZoomLevel*clusterFactor) {
                makeClusters(params.scale);
                lastClusterZoomLevel = params.scale;
            }
        }
        else {
            openClusters(params.scale);
        }
    });

    // if we click on a node, we want to open it up!
    network.on("selectNode", function (params) {
        if (params.nodes.length == 1) {
            if (network.isCluster(params.nodes[0]) == true) {
                network.openCluster(params.nodes[0])
            }
        }
    });


    // make the clusters
    function makeClusters(scale) {
        var clusterOptionsByData = {
            processProperties: function (clusterOptions, childNodes) {
                clusterIndex = clusterIndex + 1;
                var childrenCount = 0;
                for (var i = 0; i < childNodes.length; i++) {
                    childrenCount += childNodes[i].childrenCount || 1;
                }
                clusterOptions.childrenCount = childrenCount;
                clusterOptions.label = "# " + childrenCount + "";
                clusterOptions.font = {size: childrenCount*5+30}
                clusterOptions.id = 'cluster:' + clusterIndex;
                clusters.push({id:'cluster:' + clusterIndex, scale:scale});
                return clusterOptions;
            },
            clusterNodeProperties: {borderWidth: 3, shape: 'database', font: {size: 30}}
        }
        network.clusterOutliers(clusterOptionsByData);
        if (document.getElementById('stabilizeCheckbox').checked === true) {
            network.stabilize();
        }
    }

    // open them back up!
    function openClusters(scale) {
        var newClusters = [];
        var declustered = false;
        for (var i = 0; i < clusters.length; i++) {
            if (clusters[i].scale < scale) {
                network.openCluster(clusters[i].id);
                lastClusterZoomLevel = scale;
                declustered = true;
            }
            else {
                newClusters.push(clusters[i])
            }
        }
        clusters = newClusters;
        if (declustered === true && document.getElementById('stabilizeCheckbox').checked === true) {
            network.stabilize();
        }
    }


</script>

</body>
</html>
